You can look up the cert. here:
http://www.psacard.com/verification/verify.chtml
Also, if you do a google search for that cert. number and "babe ruth" you get the following cached webpage:
http://webcache.googleusercontent.co...www.google.com
The eBay listing is no longer viewable, but this page which re-presented the eBay content on its own site is still there (clicking on Buy It Now takes you to the defunct eBay page). Unfortunately none of the photos are viewable, so I can't be sure if it's the same ball, or just the same cert. number.
I like how the seller refers to him as "The Big Gambino"
